Fixed typo in include guard define
Fixed typo in include guard define

Found by a cool new warning in clang:

VTK/Rendering/FreeType/vtkMathTextUtilities.h:21:9: warning: '__vtkMathTextUtilities_h' is used as a header guard here, followed by #define of a different macro [-Wheader-guard]

        ^~~~~~~~~~~~~~~~~~~~~~~~
VTK/Rendering/FreeType/vtkMathTextUtilities.h:22:9: note: '__vtkMathTypeUtilities_h' is defined here; did you mean '__vtkMathTextUtilities_h'?

        ^~~~~~~~~~~~~~~~~~~~~~~~
        __vtkMathTextUtilities_h

Change-Id: I0ed048fcdfa69f6c47308987c8901eb0e56459a1

berendkleinhaneveld/VTK,johnkit/vtk-dev,SimVascular/VTK,hendradarwin/VTK,sumedhasingla/VTK,jmerkow/VTK,keithroe/vtkoptix,sankhesh/VTK,johnkit/vtk-dev,jmerkow/VTK,sumedhasingla/VTK,msmolens/VTK,sankhesh/VTK,candy7393/VTK,johnkit/vtk-dev,demarle/VTK,msmolens/VTK,gram526/VTK,jmerkow/VTK,sankhesh/VTK,mspark93/VTK,candy7393/VTK,hendradarwin/VTK,mspark93/VTK,gram526/VTK,sankhesh/VTK,msmolens/VTK,hendradarwin/VTK,keithroe/vtkoptix,demarle/VTK,demarle/VTK,sankhesh/VTK,ashray/VTK-EVM,sumedhasingla/VTK,mspark93/VTK,ashray/VTK-EVM,sumedhasingla/VTK,gram526/VTK,ashray/VTK-EVM,biddisco/VTK,keithroe/vtkoptix,biddisco/VTK,keithroe/vtkoptix,mspark93/VTK,biddisco/VTK,collects/VTK,sumedhasingla/VTK,demarle/VTK,demarle/VTK,demarle/VTK,biddisco/VTK,mspark93/VTK,ashray/VTK-EVM,SimVascular/VTK,berendkleinhaneveld/VTK,johnkit/vtk-dev,ashray/VTK-EVM,collects/VTK,biddisco/VTK,hendradarwin/VTK,sankhesh/VTK,johnkit/vtk-dev,candy7393/VTK,biddisco/VTK,SimVascular/VTK,jmerkow/VTK,gram526/VTK,berendkleinhaneveld/VTK,candy7393/VTK,sankhesh/VTK,gram526/VTK,jmerkow/VTK,collects/VTK,keithroe/vtkoptix,SimVascular/VTK,ashray/VTK-EVM,msmolens/VTK,gram526/VTK,berendkleinhaneveld/VTK,jmerkow/VTK,ashray/VTK-EVM,sumedhasingla/VTK,demarle/VTK,johnkit/vtk-dev,candy7393/VTK,sankhesh/VTK,ashray/VTK-EVM,collects/VTK,keithroe/vtkoptix,hendradarwin/VTK,candy7393/VTK,msmolens/VTK,msmolens/VTK,mspark93/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,gram526/VTK,berendkleinhaneveld/VTK,SimVascular/VTK,sumedhasingla/VTK,jmerkow/VTK,collects/VTK,johnkit/vtk-dev,SimVascular/VTK,hendradarwin/VTK,SimVascular/VTK,keithroe/vtkoptix,mspark93/VTK,sumedhasingla/VTK,msmolens/VTK,candy7393/VTK,mspark93/VTK,gram526/VTK,jmerkow/VTK,candy7393/VTK,biddisco/VTK,demarle/VTK,hendradarwin/VTK,keithroe/vtkoptix,collects/VTK,SimVascular/VTK,msmolens/VTK